EPSA Philosophical Issues in the Sciences by Mauricio Suárez Mauro Dorato & Miklós Rédei

Author:Mauricio Suárez, Mauro Dorato & Miklós Rédei
Language: eng
Format: epub
Publisher: Springer Netherlands, Dordrecht

16.3.2 Constraint Dependence

In Newtonian physics, the minimum requirement for a mass density tensor to be regarded as representing a physically possible mass density is that it is positive. Similarly, in relativistic field theory it is demanded that the mass–energy density is positive in any frame of reference, for any observer. This constraint is known as the weak energy condition. Malament (2007, p. 240) defines it in the following way:

Weak Energy Condition Given any future-directed unit time-like vector ζ a at any point in M, T ab ζ a ζ b ≥ 0.

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